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D25 Diode voltage variance ??

 
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Bill Schlatterer



Joined: 09 Jan 2006
Posts: 195

PostPosted: Mon Jan 16, 2006 6:46 pm    Post subject: D25 Diode voltage variance ?? Reply with quote

Anyone? Wiring per Z13 with Main Bus and E-Bus. I have the D25 diode
installed between them per diagrams. Just for fun, I was checking voltage
at the Main Bus which was 12.3 but on the E-Bus (one D25 and 6 inches of
14ga away), it was down to 11.7 volts for a loss of .6 volts. This seemed
like a lot of voltage loss so I tried another D25 and it read an even 12.0
volts for a loss of .3.

Now I'm wondering if either of these is normal and if so what is acceptable
loss between the buses?

Thanks Bill S
7a Ark


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ceengland(at)bellsouth.ne
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PostPosted: Mon Jan 16, 2006 6:53 pm    Post subject: D25 Diode voltage variance ?? Reply with quote

Bill Schlatterer wrote:

Quote:

Anyone? Wiring per Z13 with Main Bus and E-Bus. I have the D25 diode
installed between them per diagrams. Just for fun, I was checking voltage
at the Main Bus which was 12.3 but on the E-Bus (one D25 and 6 inches of
14ga away), it was down to 11.7 volts for a loss of .6 volts. This seemed
like a lot of voltage loss so I tried another D25 and it read an even 12.0
volts for a loss of .3.

Now I'm wondering if either of these is normal and if so what is acceptable
loss between the buses?

Thanks Bill S
7a Ark


Normal voltage drop across a forward biased silicon diode is ~.6 volts.


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mprather(at)spro.net
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PostPosted: Mon Jan 16, 2006 7:16 pm    Post subject: D25 Diode voltage variance ?? Reply with quote

While the voltage drop across vs. current through a diode is not linear,
certain places within the "I-V" curve are nearly so...

http://en.wikipedia.org/wiki/Image:Rectifier_vi_curve.GIF

- In this application, we are forward biased.

When you say that you measured the voltage drop across each diode, I
assume you were checking this while it was installed in the circuit, and
while the diode was conducting current.. Roughly, was the current through
the diode the same in each case (same number of items connected to the
e-bus)?

To answer your question, 0.3V sounds a little low for a regular Si
rectifier, while 0.6V sounds pretty typical (actually, still a little
low). I would guess that the diode which showed a 0.3V drop wasn't
carrying much (any) current at the time of the test.
Regards,

Matt-

Quote:

<billschlatterer(at)sbcglobal.net>
Anyone? Wiring per Z13 with Main Bus and E-Bus. I have the D25 diode
installed between them per diagrams. Just for fun, I was checking
voltage at the Main Bus which was 12.3 but on the E-Bus (one D25 and 6
inches of 14ga away), it was down to 11.7 volts for a loss of .6 volts.
This seemed like a lot of voltage loss so I tried another D25 and it
read an even 12.0 volts for a loss of .3.

Now I'm wondering if either of these is normal and if so what is
acceptable loss between the buses?

Thanks Bill S
7a Ark




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BigD(at)DaveMorris.com
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PostPosted: Mon Jan 16, 2006 7:22 pm    Post subject: D25 Diode voltage variance ?? Reply with quote

The 0.6V is normal. Remember when the diode is in the circuit, you're
running on alternator with something higher than 12.3V, so even with the
voltage drop, it will be within tolerable limits. When the alternator is
offline and you need maximum voltage, you are powering the E-bus through
the switch, not through the diode, so there will be no voltage drop.

Dave Morris

At 08:45 PM 1/16/2006, you wrote:
Quote:

<billschlatterer(at)sbcglobal.net>
Anyone? Wiring per Z13 with Main Bus and E-Bus. I have the D25 diode
installed between them per diagrams. Just for fun, I was checking voltage
at the Main Bus which was 12.3 but on the E-Bus (one D25 and 6 inches of
14ga away), it was down to 11.7 volts for a loss of .6 volts. This seemed
like a lot of voltage loss so I tried another D25 and it read an even 12.0
volts for a loss of .3.

Now I'm wondering if either of these is normal and if so what is acceptable
loss between the buses?

Thanks Bill S
7a Ark




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Bill Schlatterer



Joined: 09 Jan 2006
Posts: 195

PostPosted: Mon Jan 16, 2006 7:29 pm    Post subject: D25 Diode voltage variance ?? Reply with quote

Thanks for the reply! Seemed like a lot but I guess this isn't really
important because in normal ops, the active system keeps it up and in a low
voltage situation, the Main and D25 are out of action anyway and the E-Bus
circuit gets remaining battery power to the E-Bus with little or no loss.

Thanks Bill S

--


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